right now she's making what may be her final appearance on capitol hill introducing john kerry at his confirmation hearing. he is likely to be asked how he would handle those threats as the next secretary of state. >> margaret brennan thank you. "washington post" columnist david ignatius had written extensively about the engazie attacks. good morning. >> good morning, charlie. >> we begin with the questions, whether secretary of state took responsibility, answered all the questions and put this behind her? >> she gave a good account of herself, she gave as good as she got. it was an intense session. i think on the sound bite that we'll remember secretary clinton asking what difference does it make? knowing exactly how this happened. i think it does make a difference, and the reason is it's clear in hindsight the united states simply didn't know enough about what was happening in benghazi on the day that these four americans were killed. the intelligence wasn't good the diplomatic security wasn't good, efforts to fix it had failed, and in that sense, secretary clinton is taking respons